Our Verdict
Alen BreatheSmart 45i Wins

It boasts a 1216 CADR for smoke and covers 1900 sq ft, significantly outperforming Dyson's 0 CADR and unspecified coverage. Choose Dyson for its integrated cooling fan and general air quality sensing, if pure air purification isn't the priority.
Bottom Line: Alen BreatheSmart 45i is the better choice. It boasts a 1216 CADR for smoke and covers 1900 sq ft, significantly outperforming Dyson's 0 CADR and unspecified coverage.
Key Differences
The most significant spec differences at a glance
Cadr Smoke
100% moreCoverage Sq Ft
100% moreAdvantages
Where each product wins
Alen
- Cadr Smoke: 100% higher (1216 vs 0)
- Coverage Sq Ft: 100% higher (1900 vs 0)
Who Should Buy Which?
Find the right product for your needs
Buy Alen if...
Alen Air Purifier BreatheSmart
The ideal buyer for the Alen BreatheSmart 45i is someone prioritizing robust air purification for large living spaces, up to 1900 sq ft. If you're concerned about smoke, VOCs, dust, and allergens, and need a powerful unit with a 1216 CADR for smoke, this is your choice. It's perfect for bedrooms due to its quiet operation and smart sensor that auto-adjusts, ensuring a clean environment for sensitive individuals. Budget-wise, they are willing to invest in high-performance air quality.
Buy Dyson if...
Dyson Purifier Cool™ Autoreact
The Dyson Purifier Cool Autoreact TP7A is perfect for individuals seeking a multi-functional device that combines air purification with a personal cooling fan. If you live in a space where cooling airflow is as important as air quality, and robust smoke filtration (CADR 0) isn't your primary concern, this is for you. It appeals to those who appreciate automatic operation, sleek design, and the ability to choose between direct or diffused airflow, even if specific room coverage isn't provided.
Spec Comparison
5 specs compared
| Specification | ![]() | ![]() |
|---|---|---|
| Price | $464 | $399 |
| Rating | 4.4(60) | 4.4(170) |
| Cadr Smoke | 1216 | 0 |
| Coverage Sq Ft | 1900 | 0 |
| Filter Type | HEPA | — |
| Model Number | 45i_V2 | — |
| Smart Sensor | Yes | Yes |
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Pros & Cons
Quick overview of strengths and weaknesses
Alen Air Purifier
- Covers up to 1900 sq ft hourly
- Captures particles down to 0.1 micron
- Filters VOCs, odors, chemicals
- Quiet operation promotes sleep
- Limited absorption for heavy odors/chemicals
- Requires periodic filter replacement
Dyson Purifier Cool™
- Automatic air purification
- Provides cooling airflow
- 360-degree filtration system
- User selects direct or diffused airflow
- Zero CADR rating for smoke
- No specified room coverage area
Frequently Asked Questions
Common questions about this comparison
Which is better for a large room with smoke concerns?
Alen BreatheSmart 45i is far better, with a 1216 CADR for smoke and 1900 sq ft coverage. The Dyson Purifier Cool Autoreact TP7A has a 0 CADR for smoke and no specified coverage, making it unsuitable for this need.
What is the main difference in room coverage?
The Alen BreatheSmart 45i is rated to cover up to 1900 sq ft hourly. In contrast, the Dyson Purifier Cool Autoreact TP7A has no specified room coverage area, suggesting it's not designed for specific room sizes.
Do either of these products offer additional functions beyond purification?
Yes, the Dyson Purifier Cool Autoreact TP7A also functions as a cooling fan, offering either direct or diffused airflow. The Alen BreatheSmart 45i focuses solely on robust air purification performance.
Which product is more effective at capturing fine particles and VOCs?
The Alen BreatheSmart 45i captures particles down to 0.1 micron and filters VOCs, odors, and chemicals. While Dyson has a 360-degree filtration system, specific micron capture details for particles or VOC removal efficacy are not provided in its specs.
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